In a virtual private network system accessed by an internet, a virtual local area network (LAN) is connected to a LAN emulation server and IAN emulation clients, and a router is connected between the internet and the virtual LAN. Also, a public mobile data network is connected to a location register...http://www.google.com/patents/US6016318?utm_source=gb-gplus-sharePatent US6016318 - Virtual private network system over public mobile data network and virtual LAN
